US20040211382A1 - Engine including electrical interference shield - Google Patents
Engine including electrical interference shield Download PDFInfo
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- US20040211382A1 US20040211382A1 US10/757,025 US75702504A US2004211382A1 US 20040211382 A1 US20040211382 A1 US 20040211382A1 US 75702504 A US75702504 A US 75702504A US 2004211382 A1 US2004211382 A1 US 2004211382A1
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- United States
- Prior art keywords
- engine
- intake
- crankcase
- plenum
- intake plenum
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
- F02M35/10144—Connections of intake ducts to each other or to another device
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
- F02B61/04—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B75/00—Other engines
- F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
- F02B75/18—Multi-cylinder engines
- F02B75/24—Multi-cylinder engines with cylinders arranged oppositely relative to main shaft and of "flat" type
- F02B75/243—Multi-cylinder engines with cylinders arranged oppositely relative to main shaft and of "flat" type with only one crankshaft of the "boxer" type, e.g. all connecting rods attached to separate crankshaft bearings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
- F02M35/10249—Electrical or electronic devices fixed to the intake system; Electric wiring
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/104—Intake manifolds
- F02M35/116—Intake manifolds for engines with cylinders in V-arrangement or arranged oppositely relative to the main shaft
- F02M35/1165—Boxer or pancake engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/16—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines characterised by use in vehicles
Definitions
- the present invention relates to an internal combustion engine, including a crankcase having a plurality of cylinder bores. More particularly, the present invention relates to an engine with multiple horizontally-opposed cylinders, which is also provided with a shield to protect electrical parts of the engine against electromagnetic waves and high voltage.
- the present invention has been made in view of the situation described above, and it is an object of the present invention to provide a horizontally-opposed engine wherein electric parts are shielded from electromagnetic waves and high voltage, while making it possible to reduce of the number of parts and also of the cost of manufacture, and to achieve a generally compact configuration of the engine.
- an engine has an engine body including a crankcase, and includes a plurality of cylinder bores.
- the engine includes an intake plenum or intake manifold, having an intake chamber formed therein which is common to all of the cylinder bores, and the intake plenum or manifold is spaced away from the crankcase.
- a plurality of electric parts are disposed around the intake plenum or manifold, and the plurality of electric parts are covered with a single electromagnetic shield, attached to the engine body in such a manner as to cover at least part of the intake manifold.
- an engine is characterized, in addition to the configuration of the invention as set forth in the first aspect, in that the engine body includes the cylinder bores opposed to each other and sandwiching a crankshaft therebetween, which is rotatably supported in the crankcase, from the opposite sides thereof.
- the intake plenum is disposed above the crankcase.
- an engine is characterized, in addition to the configuration of the invention as set forth the first aspect, in that an electronic control unit, which is one of the plurality of electric parts, is attached to an outer face of a side wall of the intake manifold, and a sensor for detecting a condition in the intake chamber extends from the electronic control unit through the side wall, and includes an end which is inserted in the intake chamber within the plenum or manifold.
- the engine has an engine body including a crankcase with a plurality of cylinder bores, and an intake manifold having a plurality of intake pipes individually corresponding to the cylinder bores.
- the intake manifold is disposed on a side portion of the engine body, featuring a shield cover which interconnects the intake pipes, and covers a plurality of electric parts on the intake manifold.
- the plurality of electric parts are covered with and shielded by the single shield cover. Consequently, the electric parts can be shielded while making it possible to reduce the number of engine parts, and also to reduce the cost and achieve a generally compact configuration of the engine.
- the number of parts can be reduced, the cost can be reduced, and a generally compact configuration of the horizontally opposed engine can be achieved.
- the electronic control unit can be shielded, and the sensor for detecting a condition in the intake chamber, is connected directly to the electronic control unit. Consequently, the manual labor required to connect leads can be reduced or eliminated.
- the plurality of electric parts are covered with and shielded by the shield cover provided on the intake manifold. Consequently, the electric parts can be effectively shielded while reducing the number of engine parts, and a generally compact configuration of the engine can be achieved.
- FIG. 1 is a side elevational view of an engine according to a first working example of a selected illustrative embodiment of the present invention.
- FIG. 2 is a top plan view, partly broken away, of the engine of FIG. 1.
- FIG. 3 is an enlarged front elevational view of the engine of FIGS. 1-2, as viewed in the direction indicated by an arrow mark 3 of FIG. 1.
- FIG. 4 is a top plan view of an engine body, which is part of the engine of FIGS. 1-3.
- FIG. 5 is a sectional view of the engine of FIGS. 1-3, taken along line 5 - 5 of FIG. 3.
- FIG. 6 is an environmental side plan view, partially broken away, of the engine of FIGS. 1-3 shown installed in the front end of an airplane.
- FIG. 7 is a top plan view, partly broken away, of an engine according to a second working example of the invention.
- FIG. 8 is an enlarged sectional view of an intake manifold which is part of the engine of FIG. 7, taken along line 8 - 8 thereof.
- FIG. 9 is a top plan view of an engine according to a third working example of the invention.
- FIG. 10 is an enlarged sectional view of an intake manifold, taken along line 10 - 10 of FIG. 9.
- FIG. 1 is a side elevational view of the engine according to the first embodiment.
- FIG. 2 is a top plan view, partly cut away, of the engine.
- FIG. 3 is an enlarged front elevational view, as viewed in the direction indicated by an arrow mark 3 of FIG. 1.
- FIG. 4 is a plan view of the engine body, which is a part of the engine.
- FIG. 5 is a sectional view of the engine, taken along line 5 - 5 of FIG. 3.
- FIG. 6 is a side elevational view, partly cut away, of the engine shown incorporated in the front end of an airplane.
- the horizontally opposed, four-cylinder, four-cycle engine hereof is incorporated, for example, in an airplane, and is accommodated in a front cowl 72 of a body 71 of the airplane, and is situated such that an axial line of a crankshaft 11 extends forward and backward relative to a longitudinal axis of the airplane body.
- a propeller 74 having a plurality of propeller blades 73 , is coaxially coupled to the front end of the crankshaft 11 .
- an engine body 12 of the engine includes a left engine block 13 L, disposed on the left side when the engine is viewed from the rear, and a right engine block 13 R, disposed on the right side when the engine is viewed from the rear (from the pilot's perspective).
- the left engine block 13 L includes a left crankcase 14 L, and a left cylinder block 15 L coupled to the left crankcase 14 L.
- the right engine block 13 R includes a right crankcase 14 R coupled to the left crankcase 14 L, and a right cylinder block 15 R, coupled to the right crankcase 14 R, on the side thereof opposite the left crankcase 14 L.
- the left cylinder block 15 L includes a left cylinder barrel 16 L coupled to the left crankcase 14 L, and a left cylinder head 17 L formed integrally with the left cylinder barrel 16 L.
- the right cylinder block 15 R includes a right cylinder barrel 16 R coupled to the right crankcase 14 R, and a right cylinder head 17 R formed integrally with the right cylinder barrel 16 R.
- cylinder bores 18 L, 18 R are provided individually in the respective cylinder barrels 16 L, 16 R of the cylinder blocks 15 L, 15 R such that they substantially oppose each other, and sandwich the crankshaft 11 therebetween from the opposite sides, and such that they are offset from each other in a direction of the axial line of the crankshaft 11 , as shown.
- Pistons 20 L, 20 R are slidably fitted in the respective cylinder bores 18 L, 18 R, such that combustion chambers 19 L, 19 R are formed between the cylinder bores 18 L, 18 R and the cylinder heads 17 L, 17 R, respectively.
- the engine block sections 13 L, 13 R are disposed in an opposing relationship to each other, such that the axial lines of the cylinder bores 18 L, 18 R thereof extend substantially horizontally.
- the left and right crankcase sections 14 L, 14 R are fastened to each other, such that they cooperate with each other to form the crankcase 21 .
- the crankshaft 11 is connected to the pistons 20 L, 20 R through connecting rods 22 L, 22 R, and is rotatably supported between the left and right crankcase sections 14 L, 14 R.
- a front journal support wall 23 L, a first intermediate journal support wall 24 L, a second intermediate journal support wall 25 L, a third intermediate journal support wall 26 L and a rear journal support wall 27 L are provided in a spaced relationship from each other forward and backward on the opposite front and rear sides of the connecting rods 22 L, and on the left crankcase 14 L.
- the respective journal support walls 23 L, 24 L, 25 L, 26 L and 27 L cooperate to support a left half portion of the crankshaft 11 .
- a front journal support wall 23 R, a first intermediate journal support wall 24 R, a second intermediate journal support wall 25 R, a third intermediate journal support wall 26 R and a rear journal support wall 27 R are provided in a spaced relationship from each other forward and backward on the opposite front and rear sides of the connecting rods 22 R, and on the right crankcase 14 R.
- the respective journal support walls 23 R, 24 R, 25 R, 26 R and 27 R cooperate to support a right half portion of the crankshaft 11 .
- crankshaft 11 is rotatably supported by the journal support walls 23 L through 27 L of the left crankcase 14 L, and the journal support walls 23 R through 27 R of the right crankcase 14 R.
- journal support walls 23 L through 27 L of the left and right crankcases 14 L, 14 R are fastened together by a pair of stud bolts 28 and a pair of nuts 29 , which sandwich the crankshaft 11 therebetween from above and below.
- the stud bolts 28 are not all the same lenth, but rather, are sized and configured to fit their respective applications.
- the stud bolts 28 for fastening the front journal support walls 23 L, 23 R and the rear journal support walls 27 L, 27 R are formed longer than the stud bolts 28 for fastening the first, second and third intermediate journal support walls 24 L to 26 L; 24 R to 26 R.
- the nuts 29 are installed on the stud bolts 28 , implanted on the front journal support wall 23 L of the left crankcase 14 L and extending through the front journal support wall 23 R of the right crankcase 14 R.
- the nuts 29 engage with an outer face of the right crankcase 14 R.
- the nuts 29 are installed on the stud bolts 28 implanted on the rear journal support wall 27 R of the right crankcase 14 R and extending through the rear journal support wall 27 R of the left crankcase 14 L.
- the nuts 29 also engage with an outer face of the left crankcase 14 L.
- the nuts 29 are installed on the stud bolts 28 implanted on the second and third intermediate journal support walls 25 L, 26 L of the left crankcase 14 L and extending through the second and third intermediate journal support walls 25 R, 26 R of the right crankcase 14 R.
- the nuts 29 engage with the second and third intermediate journal support walls 25 R, 26 R.
- the nuts 29 are installed on the stud bolts 28 implanted on the first intermediate journal support wall 24 R of the right crankcase 14 R and extending through the first intermediate journal support wall 24 L of the left crankcase 14 L.
- the nuts 29 engage with the first intermediate journal support wall 24 L.
- the left, right engine blocks 13 L, 13 R are coupled to each other by pairs of through bolts 30 and two sets of pairs of stud bolts 32 individually disposed at portions of the left and right crankcases 14 L, 14 R which correspond to the first, second and third intermediate journal support walls 24 L to 26 L; 24 R to 26 R.
- the through bolts 30 extend through the engine blocks 13 L, 13 R in such a manner as to cooperate with the crankshaft 11 to sandwich therebetween the stud bolts 28 individually disposed in pairs in the first to third intermediate journal support walls 24 L to 26 L; 24 R to 26 R in order to fasten the first, second and third intermediate journal support walls 24 L to 26 R; 24 R to 24 R to each other.
- Nuts 31 are individually installed at the opposite end portions of the through bolts 30 which project from the cylinder heads 17 L, 17 R of the left, right engine blocks 13 L, 13 R.
- tool engaging portions 30 a for example, of a hexagonal shape for engaging with a tool (not shown) are provided coaxially at the opposite ends of the through bolts 30 such that they individually project from the nuts 31 .
- the stud bolts 32 are disposed at a position where they cooperate with the crankshaft 11 to sandwich therebetween a pair of stud bolts 28 for fastening the front journal support walls 23 L, 23 R of the left, right engine blocks 13 L, 13 R and another pair of stud bolts 28 for fastening the rear journal support walls 27 L, 27 R of the left, right engine blocks 13 L, 13 R.
- a support cylinder 34 is formed cooperatively by the left and right crankcases 14 L, 14 R at a front portion of the crankcase 21 , such that it projects forward.
- a front portion of the crankshaft 11 extends coaxially through the support cylinder 34 , and projects from the front end of the support cylinder 34 .
- a ring gear 35 is operatively secured to the portion of the crankshaft 11 which projects from the front end of the support cylinder 34 , and a spinner (not shown) is coaxially attached to the ring gear 35 .
- a slide bearing 36 is interposed between the front portion of the support cylinder 34 and the crankshaft 11 , and an annular seal member (not shown) is interposed between the support cylinder 34 and the crankshaft 11 , forwardly of the slide bearing 36 .
- the starting system 37 is of a conventionally known type, which includes a starter motor 38 and a pinion 39 .
- the starter motor 38 is supported at a lower portion of the left crankcase 14 L of the crankcase 21 .
- the pinion 39 projects so as to mesh with the ring gear 35 , when the speed of rotation of the starter motor 38 increases higher than a predetermined value.
- the pinion 39 is released from the ring gear 35 , and returns to its original position.
- a plurality of projections 42 are provided on a front portion of the crankshaft 11 , in an equally spaced relationship from each other in a circumferential direction inside the support cylinder 34 .
- a pair of crank angle sensors 43 , 43 for cooperating with the projections 42 to detect the crank angle are attached to the support cylinder 34 in a spaced relationship by a phase of 180 degrees from each other.
- a drive gear 44 is coaxially attached to a rear end portion of the portion of the crankshaft 11 which projects from the rear journal support walls 27 L, 27 R.
- a rotor (not shown) of a generator attached to a rear portion of the crankcase 21 , is connected coaxially against relative rotation to the drive gear 44 .
- intake ports 45 L, 45 R are provided individually corresponding to the combustion chambers 19 L, 19 R at upper portions of the left, right cylinder heads 17 L, 17 R.
- the intake ports 45 L, 45 R are formed such that they are bifurcated and connected to the combustion chambers 19 L, 19 R, respectively.
- arcuately curved intake pipes 46 L, 46 R are connected to the intake ports 45 L, 45 R and electromagnetic fuel injectors 47 L, 47 R are attached to intermediate portions of the intake pipes 46 L, 46 R, respectively.
- the electromagnetic fuel injectors 47 L on the left engine block 13 L side are connected to a common fuel rail 48 L on the left hand side, while the electromagnetic fuel injectors 47 R on the right engine block 13 R side are connected to another common fuel rail 48 R on the right.
- An intake plenum 49 is spaced away from the crankcase 21 of the engine body 12 , above the crankcase 21 in the horizontally opposed engine of the present working example, in such a manner that it is supported by the engine body 12 .
- the intake plenum 49 includes a hollow housing 99 defining an intake chamber 80 therein (FIG. 2), and also includes a plurality of runners in fluid communication with the housing and extending therefrom to supply air to respective cylinders of the engine.
- Each of the runners includes a connecting pipe, and an arcuately curved intake pipe operatively attached to the connecting pipe, as will be further discussed herein. Further, upstream ends of the intake pipes 46 L, 46 R are connected to downstream ends of the connecting pipes 50 L, 50 R.
- Upstream end portions of the connecting pipes 50 L, 50 R project into the intake chamber 80 within the intake plenum 49 from the opposite sides thereof, and upstream end portions of the connecting pipes 50 L, 50 R are open rearwardly in an flared state, like a trumpet bell, in the intake chamber 80 .
- a pair of left and right throttle bodies 52 , 52 each have a respective throttle valve 51 rotatably supported therein, and the throttle bodies 52 are connected at downstream ends thereof to a rear portion of the intake plenum 49 .
- Air cleaners 53 , 53 are connected to upstream ends of the throttle bodies 52 , 52 , and the air cleaners 53 , 53 are supported by support stays 54 , 54 which are attached to the intake plenum 49 , and extend rearwardly therefrom.
- Exhaust ports are provided at lower portions of the left and right cylinder heads 17 L, 17 R and individually correspond to the combustion chambers 19 L, 19 R.
- Exhaust pipes 55 L, 55 R are connected to the exhaust ports, extend downwardly below and around the engine body 12 , and further extend rearwardly from the engine, as shown by the left exhaust pipe 55 L in FIG. 6.
- Head covers 56 L, 56 R having a substantially H shape are coupled to the left and right cylinder heads 17 L, 17 R, respectively.
- Valve systems (not shown) for driving the intake valves and exhaust valves for controlling intake of air into the combustion chambers 19 L, 19 R and exhaust of air from the combustion chambers 19 L, 19 R are accommodated between the head covers 56 L, 56 R and the cylinder heads 17 L, 17 R.
- Upper cover plates 57 L, 57 R for covering portions of the valve systems on the intake valve side, are fastened to upper portions of the head covers 56 L, 56 R.
- lower cover plates 58 L, 58 R, for covering portions of the valve systems on the exhaust valve side are fastened to lower portions of the head covers 56 L, 56 R.
- the portions of the valve systems accommodated between the head covers 56 L, 56 R and the cylinder heads 17 L, 17 R on the intake valve side are given valve opening driving force by push rods which are pushed up at an intake stroke by power transmitted from the drive gear 44 of the crankshaft 11 .
- the push rods of the individual combustion chambers 19 L, 19 R are movably inserted in axial directions in push rod guide pipes 59 L, 59 R.
- the push rod guide pipes 59 L, 59 R are disposed below the cylinder blocks 15 L, 15 R on the opposite left and right sides of the crankcase 21 and interconnect central portions forward and backward of lower portions of the left and right crankcases 14 L, 14 R and the head covers 56 L, 56 R.
- the portions on the exhaust valve side of the valve systems accommodated between the head covers 56 L, 56 R and the cylinder heads 17 L, 17 R are given valve opening driving force by pull rods which are pulled down at an exhaust stroke by power transmitted from the drive gear 44 of the crankshaft 11 .
- the pull rods of the combustion chambers 19 L, 19 R are inserted for movement in axial directions in pull rod guide pipes 60 L, 60 R.
- the pull rod guide pipes 60 L, 60 R are disposed below the push rod guide pipes 59 L, 59 R and interconnect central portions forward and backward of lower portions of the left and right crankcases 14 L, 14 R and the head covers 56 L, 56 R.
- Pairs of ignition plugs 61 L, 61 R are attached individually for the combustion chambers 19 L, 19 R to the cylinder heads 17 L, 17 R, respectively.
- Ignition coils 62 L, 62 R which are electric parts, are attached to side faces of upper portions of the cylinder heads 17 L, 17 R between the intake pipes 46 L, 46 R such that they are juxtaposed for each pair on the opposite sides of the intake plenum 49 .
- Pairs of high-tension cables 63 are connected individually to the ignition coils 62 L, 62 R and connected to the ignition plugs 61 L, 61 R.
- the high tension cables 63 , 63 connecting to the ignition coils 62 L, 62 R are connected to the ignition plugs 61 L, 61 R of the alternate combustion chambers 19 L, 19 R.
- An electronic control unit 64 which is one of the plurality of electric parts, is attached to an outer face of a front side wall of the intake plenum 49 in order to control operation of the engine.
- An intake pressure sensor 65 and an intake air temperature sensor 66 for detecting the intake pressure and the intake air temperature, respectively, in the intake chamber 80 extend through the front sidewall of the intake plenum 49 into the intake chamber 80 .
- the electromagnetic fuel injectors 47 L, 47 R the ignition coils 62 L, 62 R and the electronic control unit 64 which are electric parts, are disposed around the intake plenum 49 .
- the electromagnetic fuel injectors 47 L, 47 R ignition coils 62 L, 62 R and electronic control unit 64 are covered with a shield cover 67 attached to the engine body 12 such that it covers at least part of the intake plenum 49 .
- the shield cover 67 is formed, for example, from a steel plate such that, in the present working example, it covers most part except a rear portion of the intake plenum 49 and an upper portion of the engine body 12 .
- An opening edge of the shield cover 67 is formed such that it contacts the engine body 12 .
- the high-tension cables 63 extending from the ignition coils 62 L, 62 R are partly covered with the shield cover 67 .
- the engine body 12 is accommodated in a cowl 72 , attached to a front portion of a machine body 71 , such that the axial line of the crankshaft 11 thereof extends forward and backward, and is resiliently supported on the machine body 71 .
- a propeller 74 having a plurality of blades 73 is disposed forwardly of the cowl 72 , and the crankshaft 11 is coupled coaxially to the propeller 74 .
- Mounting members 75 are provided, for example, at four locations of a rear portion of the crankcase 21 of the engine body 12 such that they are positioned, for example, at the corners of a virtual right-angled quadrangle centered at the axial line of the crankshaft 11 , within a plane perpendicular to the axial line of the crankshaft 11 .
- the mounting members 75 are attached to front end portions of engine hangers 77 with resilient mounts 76 interposed therebetween.
- Rear end portions of the engine hangers 77 are attached to supporting members 78 provided at a front portion of the machine body 71 in corresponding relationship to the mounting members 75 , with resilient mounts 79 interposed therebetween.
- the shield cover 67 and the engine body 12 are electrically connected to each other at a plurality of locations, for example, at two locations, by bonding wires 81 .
- the engine body 12 and the engine hangers 77 are electrically connected to each other individually by bonding wires 82 extending across the resilient mounts 76 .
- the engine hangers 77 and the machine body 71 are electrically connected to each other individually by bonding wires 83 extending across the resilient mounts 79 .
- the bonding wires 81 , 82 , 83 are each formed from a braided stainless metal wire.
- Shield cover 67 , engine body 12 , engine hangers 77 and machine body 71 are electrically connected to each other by the bonding wires 81 , 82 , 83 , by which the propeller blades 73 , shield cover 67 , and machine body 71 are placed in an electrically grounded state.
- a plurality of electric parts namely, the electromagnetic fuel injectors 47 L, 47 R, ignition coils 62 L, 62 R, and electronic control unit 64 are disposed around the intake plenum 49 , located above the crankcase 21 of the engine body 12 .
- the electromagnetic fuel injectors 47 L, 47 R, ignition coils 62 L, 62 R, and electronic control unit 64 around the intake plenum 49 are covered with the shield cover 67 , attached to the engine body 12 , such that it covers at least part of the intake plenum 49 .
- the electromagnetic fuel injectors 47 L, 47 R, ignition coils 62 L, 62 R, and electronic control unit 64 which are a plurality of electric parts, are covered with and shielded by the single, unitary shield cover 67 , the electric parts are shielded while the number of shielding parts are reduced, and a generally compact configuration of the engine is achieved, when compared with an alternative arrangement wherein the electric parts are individually shielded.
- the high-tension cables 63 are partly covered with the shield cover 67 , and at the portions covered with the shield cover 67 , individual shields for the high-tension cables 63 can be removed. Therefore, a secondary voltage drop of the high-tension cables 63 can be improved by the removal of the individual shields.
- the electronic control unit 64 is attached to the outer face of the front side wall of the intake plenum 49 , and the intake pressure sensor 65 and the intake air temperature sensor 66 for detecting the intake pressure and the intake air temperature in the intake chamber 80 extend from the electronic control unit 64 through the front side wall of the intake plenum 49 , and into the intake chamber 80 . Therefore, while shielding of the electronic control unit 64 is made possible, the intake pressure sensor 65 and the intake air temperature sensor 66 are connected directly to the electronic control unit 64 , so that the labor for connection of leads can be reduced or eliminated.
- FIGS. 7 and 8 show another preferred embodiment of the present invention
- FIG. 7 is a top plan view, partly cutaway, of an engine
- FIG. 8 is an enlarged sectional view taken along line 8 - 8 of FIG. 7.
- a shield cover 87 is attached to an engine body 12 such that it covers at least part of an intake plenum 49 , and in the present preferred embodiment, the shield cover 87 covers most of the intake plenum 49 .
- Electromagnetic fuel injectors 47 L, 47 R, ignition coils 62 L, 62 R, knock sensors 88 L, 88 R, and a pair of water temperature sensors 90 , 90 are disposed around the intake plenum 49 and are covered with the shield cover 87 .
- a pair of intake pressure sensors 65 , 65 , a pair of intake air temperature sensors 66 , 66 , and a pair of atmospheric pressure sensors 89 , 89 which are electric parts, are disposed on the intake plenum 49 in such a manner as to be covered with the shield cover 87 .
- the maximum gap between the shield cover 87 and counterpart members to which the shield cover 87 is opposed depends upon the shielding necessary for protection of an object from certain frequencies of electromagnetic waves.
- the maximum gap where the electromagnetic wave of 100 MHz to 18 GHz is shielding an object is 4.17 mm.
- a gasket 91 as shown in FIG. 8 is interposed between the shield cover 87 and the intake plenum 49 and shield cover 87 , which are counterpart members to which the shield cover 87 is opposed.
- Gasket 91 is made of an electrically conductive, resilient material, and includes cylindrical portion 91 a and engaging portions 91 b formed integrally with cylindrical portion 91 a .
- Cylindrical portion 91 a is sandwiched between and yielded by the shield cover 87 and the intake plenum 49 or engine body 12 .
- Engaging portions 91 b are formed in an arrowhead shape, as shown, and are provided at a plurality of locations of an outer periphery of cylindrical portion 91 a .
- Engaging portions 91 b are situated and engaged with engaging holes 92 provided in the shield cover 87 .
- FIGS. 9 and 10 show a third preferred embodiment of the present invention
- FIG. 9 is a top plan view of an engine
- FIG. 10 is an enlarged sectional view taken along line 10 - 10 of FIG. 9.
- An intake manifold 93 is disposed above an engine body 12 .
- the intake manifold 93 includes intake pipes 94 L, 95 L, 94 R, 95 R individually corresponding to cylinder bores 18 L, 18 R provided in the engine body 12 .
- the intake manifold 93 also includes a collecting intake pipe 96 , to which upstream ends of the intake pipes 94 L, 95 L, 94 R, 95 R are commonly connected.
- the intake pipes 94 L, 95 L, 94 R, 95 R are formed such that they are curved to the rear side above the engine body 12 .
- the collecting intake pipe 96 is disposed above a rear portion of the engine body 12 and connected to an intake chamber (not shown).
- Shield cover 97 is provided on the intake manifold 93 in such a manner as to cover the engine body 12 from above and interconnects the intake pipes 94 L, 95 L, 94 R, 95 R.
- the shield cover 97 may be formed integrally with the intake pipes 94 L, 95 L, 94 R, 95 R as shown in FIG. 10, or may alternatively be welded to the intake pipes 94 L, 95 L, 94 R, 95 R.
- connection portions of the shield cover 97 to the intake pipes 94 L, 95 L, 94 R, 95 R are set to positions spaced from and opposite to the engine body 12 with respect to a plane which passes axial lines of the intake pipes 94 L, 95 L, 94 R, 95 R and is opposed to the engine body 12 in order to assure an accommodation space formed between the shield cover 97 and the engine body 12 .
- the electric parts such as the ignition coils 62 L, 62 R and the electromagnetic fuel injectors 47 L, 47 R disposed on the engine body 12 , the intake pressure sensors 65 L, 65 R attached to the opposite sides of the collecting intake pipe 96 and the intake air temperature sensors 66 , 66 in pair attached to the branching portions of the intake pipes 94 L, 94 R are covered with the shield cover 97 .
- a plurality of electric parts such as the ignition coils 62 L, 62 R, electromagnetic fuel injectors 47 L, 47 R, intake pressure sensors 65 L, 65 R, and intake air temperature sensors 66 are covered with and shielded by the shield cover 97 provided on the intake manifold 93 . Consequently, the electric parts can be shielded, while reduction of the number of parts is achieved and a generally compact configuration of the engine is achieved.
Abstract
A shield cover for an engine is provided to shield electric parts, in an engine wherein an engine body includes a crankcase having a plurality of cylinder bores. An intake chamber common to all of the cylinder bores is spaced away from the crankcase. The shield cover is made in one piece, making it possible to reduce the number of parts and also of the cost, and to achieve a generally compact configuration of the engine. A plurality of electric parts 47L, 47R, 62L, 62R, 64 are disposed around an intake plenum 49, and the plural electric parts 47L, 47R, 62L, 62R, 64 are covered with a shield cover 67 attached to the engine body 12 in such a manner as to cover at least part of the intake plenum 49.
Description
- The present application claims priority under 35 USC 119 based on Japanese parent application No. 2003-019334, filed 28 Jan. 2003 and No. 2003-286833, filed 05 Aug. 2003.
- 1. Field of the Invention
- The present invention relates to an internal combustion engine, including a crankcase having a plurality of cylinder bores. More particularly, the present invention relates to an engine with multiple horizontally-opposed cylinders, which is also provided with a shield to protect electrical parts of the engine against electromagnetic waves and high voltage.
- 2. Description of the Background Art
- An engine having multiple horizontally-opposed cylinders already known, for example, in Japanese Laid-Open Patent No. 2002-213302.
- If an engine such as that described in the above reference is incorporated, for example, in an airplane, then it is necessary to take countermeasures against electromagnetic waves and high voltage, for electric parts provided for the engine. In the conventional horizontally-opposed engine, it is necessary to individually shield the electric parts disposed discretely at different portions of the engine. Therefore, many high-cost parts must be used, and this gives rise to an increased number of parts required, and an increase in the cost of manufacture. As a result, the engine must be produced at a high volume in order to be profitable.
- The present invention has been made in view of the situation described above, and it is an object of the present invention to provide a horizontally-opposed engine wherein electric parts are shielded from electromagnetic waves and high voltage, while making it possible to reduce of the number of parts and also of the cost of manufacture, and to achieve a generally compact configuration of the engine.
- In order to attain the object described above, according to a first aspect of the invention, an engine has an engine body including a crankcase, and includes a plurality of cylinder bores.
- The engine includes an intake plenum or intake manifold, having an intake chamber formed therein which is common to all of the cylinder bores, and the intake plenum or manifold is spaced away from the crankcase. A plurality of electric parts are disposed around the intake plenum or manifold, and the plurality of electric parts are covered with a single electromagnetic shield, attached to the engine body in such a manner as to cover at least part of the intake manifold.
- According to an embodiment of the invention as set forth in a second aspect hereof, an engine is characterized, in addition to the configuration of the invention as set forth in the first aspect, in that the engine body includes the cylinder bores opposed to each other and sandwiching a crankshaft therebetween, which is rotatably supported in the crankcase, from the opposite sides thereof. In the second aspect, the intake plenum is disposed above the crankcase.
- According to a third aspect of the described embodiment of the invention, an engine is characterized, in addition to the configuration of the invention as set forth the first aspect, in that an electronic control unit, which is one of the plurality of electric parts, is attached to an outer face of a side wall of the intake manifold, and a sensor for detecting a condition in the intake chamber extends from the electronic control unit through the side wall, and includes an end which is inserted in the intake chamber within the plenum or manifold.
- Further, in order to attain the object described above, according to a fourth aspect of the described embodiment of the invention, the engine has an engine body including a crankcase with a plurality of cylinder bores, and an intake manifold having a plurality of intake pipes individually corresponding to the cylinder bores. The intake manifold is disposed on a side portion of the engine body, featuring a shield cover which interconnects the intake pipes, and covers a plurality of electric parts on the intake manifold.
- According to an embodiment of the invention as set forth in the first aspect, the plurality of electric parts are covered with and shielded by the single shield cover. Consequently, the electric parts can be shielded while making it possible to reduce the number of engine parts, and also to reduce the cost and achieve a generally compact configuration of the engine.
- According to an embodiment of the invention as set forth in the second aspect, in shielding a plurality of electric parts in a horizontally opposed engine with a single electronic shield cover, the number of parts can be reduced, the cost can be reduced, and a generally compact configuration of the horizontally opposed engine can be achieved.
- According to an embodiment of the invention as set forth in the third aspect, the electronic control unit can be shielded, and the sensor for detecting a condition in the intake chamber, is connected directly to the electronic control unit. Consequently, the manual labor required to connect leads can be reduced or eliminated.
- Further, according to an embodiment of the invention as set forth in the fourth aspect hereof, the plurality of electric parts are covered with and shielded by the shield cover provided on the intake manifold. Consequently, the electric parts can be effectively shielded while reducing the number of engine parts, and a generally compact configuration of the engine can be achieved.
- For a more complete understanding of the present invention, the reader is referred to the following detailed description section, which should be read in conjunction with the accompanying drawings. Throughout the following detailed description and in the drawings, like numbers refer to like parts.
- FIG. 1 is a side elevational view of an engine according to a first working example of a selected illustrative embodiment of the present invention.
- FIG. 2 is a top plan view, partly broken away, of the engine of FIG. 1.
- FIG. 3 is an enlarged front elevational view of the engine of FIGS. 1-2, as viewed in the direction indicated by an
arrow mark 3 of FIG. 1. - FIG. 4 is a top plan view of an engine body, which is part of the engine of FIGS. 1-3.
- FIG. 5 is a sectional view of the engine of FIGS. 1-3, taken along line5-5 of FIG. 3.
- FIG. 6 is an environmental side plan view, partially broken away, of the engine of FIGS. 1-3 shown installed in the front end of an airplane.
- FIG. 7 is a top plan view, partly broken away, of an engine according to a second working example of the invention.
- FIG. 8 is an enlarged sectional view of an intake manifold which is part of the engine of FIG. 7, taken along line8-8 thereof.
- FIG. 9 is a top plan view of an engine according to a third working example of the invention.
- FIG. 10 is an enlarged sectional view of an intake manifold, taken along line10-10 of FIG. 9.
- In the following description, selected illustrative embodiments of the present invention are described, in connection with working examples shown in the accompanying drawings. The selected embodiments and working examples are intended to illustrate, rather than to limit the invention.
- FIGS. 1-6 show a first working example of the present invention, as applied to a horizontally opposed, four-cylinder, four-cycle engine. FIG. 1 is a side elevational view of the engine according to the first embodiment. FIG. 2 is a top plan view, partly cut away, of the engine. FIG. 3 is an enlarged front elevational view, as viewed in the direction indicated by an
arrow mark 3 of FIG. 1. FIG. 4 is a plan view of the engine body, which is a part of the engine. FIG. 5 is a sectional view of the engine, taken along line 5-5 of FIG. 3. FIG. 6 is a side elevational view, partly cut away, of the engine shown incorporated in the front end of an airplane. - Referring first to FIGS.1 to 3 and 6, the horizontally opposed, four-cylinder, four-cycle engine hereof is incorporated, for example, in an airplane, and is accommodated in a
front cowl 72 of abody 71 of the airplane, and is situated such that an axial line of acrankshaft 11 extends forward and backward relative to a longitudinal axis of the airplane body. Apropeller 74, having a plurality ofpropeller blades 73, is coaxially coupled to the front end of thecrankshaft 11. - Referring also to FIG. 4, an
engine body 12 of the engine includes aleft engine block 13L, disposed on the left side when the engine is viewed from the rear, and aright engine block 13R, disposed on the right side when the engine is viewed from the rear (from the pilot's perspective). - The
left engine block 13L includes aleft crankcase 14L, and aleft cylinder block 15L coupled to theleft crankcase 14L. Theright engine block 13R includes aright crankcase 14R coupled to theleft crankcase 14L, and aright cylinder block 15R, coupled to theright crankcase 14R, on the side thereof opposite theleft crankcase 14L. - The
left cylinder block 15L includes aleft cylinder barrel 16L coupled to theleft crankcase 14L, and aleft cylinder head 17L formed integrally with theleft cylinder barrel 16L. Theright cylinder block 15R includes aright cylinder barrel 16R coupled to theright crankcase 14R, and aright cylinder head 17R formed integrally with theright cylinder barrel 16R. - Referring further to FIG. 5,
cylinder bores respective cylinder barrels cylinder blocks crankshaft 11 therebetween from the opposite sides, and such that they are offset from each other in a direction of the axial line of thecrankshaft 11, as shown. -
Pistons respective cylinder bores combustion chambers cylinder bores cylinder heads - The
engine block sections right crankcase sections crankcase 21. Thecrankshaft 11 is connected to thepistons rods right crankcase sections - A front journal support wall23L, a first intermediate journal support wall 24L, a second intermediate
journal support wall 25L, a third intermediatejournal support wall 26L and a rearjournal support wall 27L are provided in a spaced relationship from each other forward and backward on the opposite front and rear sides of the connectingrods 22L, and on theleft crankcase 14L. The respectivejournal support walls crankshaft 11. - In similar fashion to that described above but on the opposite side, a front
journal support wall 23R, a first intermediatejournal support wall 24R, a second intermediatejournal support wall 25R, a third intermediatejournal support wall 26R and a rear journal support wall 27R are provided in a spaced relationship from each other forward and backward on the opposite front and rear sides of the connectingrods 22R, and on theright crankcase 14R. The respectivejournal support walls crankshaft 11. - It will therefore be understood that the
crankshaft 11 is rotatably supported by the journal support walls 23L through 27L of theleft crankcase 14L, and thejournal support walls 23R through 27R of theright crankcase 14R. - The journal support walls23L through 27L of the left and
right crankcases stud bolts 28 and a pair ofnuts 29, which sandwich thecrankshaft 11 therebetween from above and below. Thestud bolts 28 are not all the same lenth, but rather, are sized and configured to fit their respective applications. - The
stud bolts 28 for fastening the frontjournal support walls 23L, 23R and the rearjournal support walls 27L, 27R are formed longer than thestud bolts 28 for fastening the first, second and third intermediate journal support walls 24L to 26L; 24R to 26R. - The nuts29 are installed on the
stud bolts 28, implanted on the front journal support wall 23L of theleft crankcase 14L and extending through the frontjournal support wall 23R of theright crankcase 14R. The nuts 29 engage with an outer face of theright crankcase 14R. Further, the nuts 29 are installed on thestud bolts 28 implanted on the rear journal support wall 27R of theright crankcase 14R and extending through the rear journal support wall 27R of theleft crankcase 14L. The nuts 29 also engage with an outer face of theleft crankcase 14L. - Further, the nuts29 are installed on the
stud bolts 28 implanted on the second and third intermediatejournal support walls left crankcase 14L and extending through the second and third intermediatejournal support walls right crankcase 14R. The nuts 29 engage with the second and third intermediatejournal support walls stud bolts 28 implanted on the first intermediatejournal support wall 24R of theright crankcase 14R and extending through the first intermediate journal support wall 24L of theleft crankcase 14L. The nuts 29 engage with the first intermediate journal support wall 24L. - The left,
right engine blocks bolts 30 and two sets of pairs ofstud bolts 32 individually disposed at portions of the left andright crankcases - The through
bolts 30 extend through theengine blocks crankshaft 11 to sandwich therebetween thestud bolts 28 individually disposed in pairs in the first to third intermediate journal support walls 24L to 26L; 24R to 26R in order to fasten the first, second and third intermediate journal support walls 24L to 26R; 24R to 24R to each other.Nuts 31 are individually installed at the opposite end portions of the throughbolts 30 which project from thecylinder heads right engine blocks - In order to prevent the through
bolts 30 from being turned upon tightening of the nuts 31,tool engaging portions 30 a, for example, of a hexagonal shape for engaging with a tool (not shown) are provided coaxially at the opposite ends of the throughbolts 30 such that they individually project from the nuts 31. - The
stud bolts 32 of one of the two sets ofstud bolts 32 that are implanted on the frontjournal support wall 23R of thecrankcase 14R and extend through theleft engine block 13L, andnuts 33 are installed on the portions of thestud bolts 32 which project from theleft cylinder head 17L of theleft engine block 13L. Further, the other set ofstud bolts 32 are implanted on the rearjournal support wall 27L of theleft crankcase 14L and extend through theright engine block 13R, andnuts 33 are installed on the portions of thestud bolts 32 which project from thecylinder head 17R of theright engine block 13R. - The
stud bolts 32 are disposed at a position where they cooperate with thecrankshaft 11 to sandwich therebetween a pair ofstud bolts 28 for fastening the frontjournal support walls 23L, 23R of the left,right engine blocks stud bolts 28 for fastening the rearjournal support walls 27L, 27R of the left,right engine blocks - A
support cylinder 34 is formed cooperatively by the left andright crankcases crankcase 21, such that it projects forward. A front portion of thecrankshaft 11 extends coaxially through thesupport cylinder 34, and projects from the front end of thesupport cylinder 34. Aring gear 35 is operatively secured to the portion of thecrankshaft 11 which projects from the front end of thesupport cylinder 34, and a spinner (not shown) is coaxially attached to thering gear 35. Aslide bearing 36 is interposed between the front portion of thesupport cylinder 34 and thecrankshaft 11, and an annular seal member (not shown) is interposed between thesupport cylinder 34 and thecrankshaft 11, forwardly of theslide bearing 36. - Upon starting of the engine, rotational driving force is applied from a starting
system 37 to thecrankshaft 11. The startingsystem 37 is of a conventionally known type, which includes astarter motor 38 and apinion 39. Thestarter motor 38 is supported at a lower portion of theleft crankcase 14L of thecrankcase 21. Thepinion 39 projects so as to mesh with thering gear 35, when the speed of rotation of thestarter motor 38 increases higher than a predetermined value. After the engine is started, thepinion 39 is released from thering gear 35, and returns to its original position. - A plurality of
projections 42 are provided on a front portion of thecrankshaft 11, in an equally spaced relationship from each other in a circumferential direction inside thesupport cylinder 34. A pair ofcrank angle sensors projections 42 to detect the crank angle are attached to thesupport cylinder 34 in a spaced relationship by a phase of 180 degrees from each other. - As shown in FIG. 5, a
drive gear 44 is coaxially attached to a rear end portion of the portion of thecrankshaft 11 which projects from the rearjournal support walls 27L, 27R. A rotor (not shown) of a generator, attached to a rear portion of thecrankcase 21, is connected coaxially against relative rotation to thedrive gear 44. - In addition,
intake ports combustion chambers right cylinder heads intake ports combustion chambers - As shown in FIGS. 2 and 3, arcuately
curved intake pipes intake ports electromagnetic fuel injectors intake pipes electromagnetic fuel injectors 47L on theleft engine block 13L side are connected to acommon fuel rail 48L on the left hand side, while theelectromagnetic fuel injectors 47R on theright engine block 13R side are connected to anothercommon fuel rail 48R on the right. - An
intake plenum 49 is spaced away from thecrankcase 21 of theengine body 12, above thecrankcase 21 in the horizontally opposed engine of the present working example, in such a manner that it is supported by theengine body 12. Theintake plenum 49 includes ahollow housing 99 defining anintake chamber 80 therein (FIG. 2), and also includes a plurality of runners in fluid communication with the housing and extending therefrom to supply air to respective cylinders of the engine. Each of the runners includes a connecting pipe, and an arcuately curved intake pipe operatively attached to the connecting pipe, as will be further discussed herein. Further, upstream ends of theintake pipes pipes pipes intake chamber 80 within theintake plenum 49 from the opposite sides thereof, and upstream end portions of the connectingpipes intake chamber 80. - A pair of left and
right throttle bodies respective throttle valve 51 rotatably supported therein, and thethrottle bodies 52 are connected at downstream ends thereof to a rear portion of theintake plenum 49.Air cleaners throttle bodies air cleaners intake plenum 49, and extend rearwardly therefrom. - Exhaust ports (not shown) are provided at lower portions of the left and
right cylinder heads combustion chambers Exhaust pipes engine body 12, and further extend rearwardly from the engine, as shown by theleft exhaust pipe 55L in FIG. 6. - Head covers56L, 56R having a substantially H shape are coupled to the left and
right cylinder heads combustion chambers combustion chambers cylinder heads Upper cover plates lower cover plates - The portions of the valve systems accommodated between the head covers56L, 56R and the
cylinder heads drive gear 44 of thecrankshaft 11. The push rods of theindividual combustion chambers rod guide pipes rod guide pipes cylinder blocks crankcase 21 and interconnect central portions forward and backward of lower portions of the left andright crankcases - The portions on the exhaust valve side of the valve systems accommodated between the head covers56L, 56R and the
cylinder heads drive gear 44 of thecrankshaft 11. The pull rods of thecombustion chambers rod guide pipes rod guide pipes rod guide pipes right crankcases - Pairs of ignition plugs61L, 61R are attached individually for the
combustion chambers cylinder heads Ignition coils cylinder heads intake pipes intake plenum 49. Pairs of high-tension cables 63 are connected individually to the ignition coils 62L, 62R and connected to the ignition plugs 61L, 61R. - In order to make it certain that ignition occur in each of the
combustion chambers high tension cables alternate combustion chambers - An
electronic control unit 64, which is one of the plurality of electric parts, is attached to an outer face of a front side wall of theintake plenum 49 in order to control operation of the engine. Anintake pressure sensor 65 and an intakeair temperature sensor 66 for detecting the intake pressure and the intake air temperature, respectively, in theintake chamber 80, extend through the front sidewall of theintake plenum 49 into theintake chamber 80. - In addition, the
electromagnetic fuel injectors electronic control unit 64, which are electric parts, are disposed around theintake plenum 49. In this instance, theelectromagnetic fuel injectors 47 R ignition coils electronic control unit 64 are covered with ashield cover 67 attached to theengine body 12 such that it covers at least part of theintake plenum 49. - The
shield cover 67 is formed, for example, from a steel plate such that, in the present working example, it covers most part except a rear portion of theintake plenum 49 and an upper portion of theengine body 12. An opening edge of theshield cover 67 is formed such that it contacts theengine body 12. Also the high-tension cables 63 extending from the ignition coils 62L, 62R are partly covered with theshield cover 67. - Where such an engine as described above is incorporated in an airplane, as shown in FIG. 6, the
engine body 12 is accommodated in acowl 72, attached to a front portion of amachine body 71, such that the axial line of thecrankshaft 11 thereof extends forward and backward, and is resiliently supported on themachine body 71. Apropeller 74 having a plurality ofblades 73 is disposed forwardly of thecowl 72, and thecrankshaft 11 is coupled coaxially to thepropeller 74. - Mounting
members 75 are provided, for example, at four locations of a rear portion of thecrankcase 21 of theengine body 12 such that they are positioned, for example, at the corners of a virtual right-angled quadrangle centered at the axial line of thecrankshaft 11, within a plane perpendicular to the axial line of thecrankshaft 11. The mountingmembers 75 are attached to front end portions ofengine hangers 77 withresilient mounts 76 interposed therebetween. Rear end portions of theengine hangers 77 are attached to supportingmembers 78 provided at a front portion of themachine body 71 in corresponding relationship to the mountingmembers 75, withresilient mounts 79 interposed therebetween. - The
shield cover 67 and theengine body 12 are electrically connected to each other at a plurality of locations, for example, at two locations, by bondingwires 81. Theengine body 12 and theengine hangers 77 are electrically connected to each other individually by bondingwires 82 extending across the resilient mounts 76. The engine hangers 77 and themachine body 71 are electrically connected to each other individually by bondingwires 83 extending across the resilient mounts 79. Thebonding wires -
Shield cover 67,engine body 12,engine hangers 77 andmachine body 71 are electrically connected to each other by thebonding wires propeller blades 73,shield cover 67, andmachine body 71 are placed in an electrically grounded state. - In one of the preferred embodiments, a plurality of electric parts, namely, the
electromagnetic fuel injectors ignition coils electronic control unit 64 are disposed around theintake plenum 49, located above thecrankcase 21 of theengine body 12. Theelectromagnetic fuel injectors ignition coils electronic control unit 64 around theintake plenum 49 are covered with theshield cover 67, attached to theengine body 12, such that it covers at least part of theintake plenum 49. - Accordingly, since the
electromagnetic fuel injectors ignition coils electronic control unit 64, which are a plurality of electric parts, are covered with and shielded by the single,unitary shield cover 67, the electric parts are shielded while the number of shielding parts are reduced, and a generally compact configuration of the engine is achieved, when compared with an alternative arrangement wherein the electric parts are individually shielded. - The high-
tension cables 63 are partly covered with theshield cover 67, and at the portions covered with theshield cover 67, individual shields for the high-tension cables 63 can be removed. Therefore, a secondary voltage drop of the high-tension cables 63 can be improved by the removal of the individual shields. - Further, the
electronic control unit 64 is attached to the outer face of the front side wall of theintake plenum 49, and theintake pressure sensor 65 and the intakeair temperature sensor 66 for detecting the intake pressure and the intake air temperature in theintake chamber 80 extend from theelectronic control unit 64 through the front side wall of theintake plenum 49, and into theintake chamber 80. Therefore, while shielding of theelectronic control unit 64 is made possible, theintake pressure sensor 65 and the intakeair temperature sensor 66 are connected directly to theelectronic control unit 64, so that the labor for connection of leads can be reduced or eliminated. - FIGS. 7 and 8 show another preferred embodiment of the present invention; FIG. 7 is a top plan view, partly cutaway, of an engine, and FIG. 8 is an enlarged sectional view taken along line8-8 of FIG. 7.
- A
shield cover 87 is attached to anengine body 12 such that it covers at least part of anintake plenum 49, and in the present preferred embodiment, theshield cover 87 covers most of theintake plenum 49.Electromagnetic fuel injectors ignition coils sensors water temperature sensors intake plenum 49 and are covered with theshield cover 87. Further, a pair ofintake pressure sensors air temperature sensors atmospheric pressure sensors intake plenum 49 in such a manner as to be covered with theshield cover 87. - The maximum gap between the
shield cover 87 and counterpart members to which theshield cover 87 is opposed, that is, theengine body 12 and theintake plenum 49, depends upon the shielding necessary for protection of an object from certain frequencies of electromagnetic waves. For example, the maximum gap where the electromagnetic wave of 100 MHz to 18 GHz is shielding an object is 4.17 mm. In order to prevent appearance of a gap greater than such a maximum gap just mentioned, such agasket 91 as shown in FIG. 8 is interposed between theshield cover 87 and theintake plenum 49 andshield cover 87, which are counterpart members to which theshield cover 87 is opposed. -
Gasket 91 is made of an electrically conductive, resilient material, and includescylindrical portion 91 a and engagingportions 91 b formed integrally withcylindrical portion 91 a.Cylindrical portion 91 a is sandwiched between and yielded by theshield cover 87 and theintake plenum 49 orengine body 12. Engagingportions 91 b are formed in an arrowhead shape, as shown, and are provided at a plurality of locations of an outer periphery ofcylindrical portion 91 a. Engagingportions 91 b are situated and engaged with engagingholes 92 provided in theshield cover 87. - Also with the present second preferred embodiment, similar effects to those of the first embodiment described hereinabove can be achieved.
- FIGS. 9 and 10 show a third preferred embodiment of the present invention; FIG. 9 is a top plan view of an engine, and FIG. 10 is an enlarged sectional view taken along line10-10 of FIG. 9.
- An
intake manifold 93 is disposed above anengine body 12. Theintake manifold 93 includesintake pipes engine body 12. Theintake manifold 93 also includes a collectingintake pipe 96, to which upstream ends of theintake pipes intake pipes engine body 12. The collectingintake pipe 96 is disposed above a rear portion of theengine body 12 and connected to an intake chamber (not shown). -
Shield cover 97 is provided on theintake manifold 93 in such a manner as to cover theengine body 12 from above and interconnects theintake pipes shield cover 97 may be formed integrally with theintake pipes intake pipes - The connection portions of the
shield cover 97 to theintake pipes engine body 12 with respect to a plane which passes axial lines of theintake pipes engine body 12 in order to assure an accommodation space formed between theshield cover 97 and theengine body 12. - The electric parts such as the ignition coils62L, 62R and the
electromagnetic fuel injectors engine body 12, theintake pressure sensors intake pipe 96 and the intakeair temperature sensors intake pipes shield cover 97. - According to the third embodiment of the present invention, a plurality of electric parts such as the ignition coils62L, 62R,
electromagnetic fuel injectors intake pressure sensors air temperature sensors 66 are covered with and shielded by theshield cover 97 provided on theintake manifold 93. Consequently, the electric parts can be shielded, while reduction of the number of parts is achieved and a generally compact configuration of the engine is achieved. - Although the present invention has been described herein with respect to a limited number of presently preferred embodiments, the foregoing description is intended to be illustrative, and not restrictive. Those skilled in the art will realize that many modifications of the preferred embodiment could be made which would be operable. All such modifications, which are within the scope of the claims, are intended to be within the scope and spirit of the present invention.
Claims (20)
1. An engine, wherein an engine body including a crankcase includes a plurality of cylinder bores, and an intake plenum common to all of said cylinder bores is operatively attached to said engine body;
characterized in that a plurality of electric parts are disposed around said intake plenum, and said plurality of electric parts are covered with a shield cover attached to said engine body in such a manner as to cover at least part of said intake plenum.
2. The engine of claim 1 , wherein said intake plenum comprises a hollow housing defining an intake chamber therein, and a plurality of runners in fluid communication with said housing and extending therefrom to supply air to respective cylinders of said engine.
3. The engine of claim 2 , wherein each of said runners comprises a connecting pipe having an outwardly flared pickup end.
4. The engine of claim 2 , wherein each of said runners further comprises an arcuately curved intake pipe operatively attached to said connecting pipe.
5. The engine of claim 2 , wherein each of said connecting pipes curves rearwardly in said plenum.
6. An engine according to claim 1 , characterized in that said engine body includes said cylinder bores opposed to each other and sandwiching a crankshaft, which is rotatably supported on said crankcase, from the opposite sides therebetween, and wherein said intake plenum is disposed above said crankcase.
7. An engine according to claim 1 , characterized in that an electronic control unit which is one of said electric parts is attached to an outer face of a side wall of said intake plenum, and a sensor for detecting a condition in said intake chamber extends from said electronic control unit through said side wall and into said intake chamber.
8. The engine of claim 1 , wherein said plurality of electrical parts includes at least two parts selected from the group consisting of coils, control modules, sensors, plug wires and injectors.
9. The engine of claim 1 , further comprising at least one throttle body operatively connected to said intake plenum.
10. The engine of claim 9 , further comprising an air cleaner housing operatively connected to said throttle body.
11. An engine, wherein an engine body including a crankcase includes a plurality of cylinder bores, and an intake plenum common to all of said cylinder bores is operatively attached to said engine body;
characterized in that a plurality of electric parts are disposed around said intake plenum, and said plural electric parts are covered with a shield cover attached to said engine body in such a manner as to cover at least part of said intake plenum,
wherein said cylinder bores are substantially opposed to each other and sandwiching a crankshaft, which is rotatably supported on said crankcase, from the opposite sides therebetween, and wherein said intake plenum is disposed above said crankcase.
12. An engine according to claim 11 , characterized in that an electronic control unit which is one of said electric parts is attached to an outer face of a side wall of said intake plenum, and a sensor for detecting a condition in said intake chamber extends from said electronic control unit through said side wall and into said intake chamber.
13. The engine of claim 11 , wherein said intake plenum comprises a hollow housing defining an intake chamber therein, and a plurality of runners in fluid communication with said housing and extending therefrom to supply air to respective cylinders of said engine.
14. The engine of claim 13 , wherein each of said runners comprises a connecting pipe having an outwardly flared pickup end.
15. The engine of claim 13 , wherein each of said runners further comprises an arcuately curved intake pipe operatively attached to said connecting pipe.
16. The engine of claim 13 , wherein each of said connecting pipes curves rearwardly in said plenum.
17. An engine according to claim 11 , wherein said plurality of electrical parts includes at least two parts selected from the group consisting of coils, control modules, sensors, plug wires and injectors.
18. The engine of claim 11 , further comprising at least one throttle body operatively connected to said intake plenum.
19. The engine of claim 11 , further comprising an air cleaner housing operatively connected to said throttle body.
20. An engine wherein an engine body including a crankcase includes a plurality of cylinder bores and an intake manifold having a plurality of intake pipes individually corresponding to said cylinder bores is operatively attached to said engine body, characterized in that a one-piece shield cover which interconnects said intake pipes and covers a plurality of electric parts is provided in such a manner as to cover a portion of said engine body.
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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JP2003019334 | 2003-01-28 | ||
JP2003-019334 | 2003-01-28 | ||
JP2003-286833 | 2003-08-05 | ||
JP2003286833A JP2004251271A (en) | 2003-01-28 | 2003-08-05 | Engine |
Publications (2)
Publication Number | Publication Date |
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US20040211382A1 true US20040211382A1 (en) | 2004-10-28 |
US7150255B2 US7150255B2 (en) | 2006-12-19 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US10/757,025 Expired - Fee Related US7150255B2 (en) | 2003-01-28 | 2004-01-14 | Engine including electrical interference shield |
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US (1) | US7150255B2 (en) |
EP (1) | EP1445468B1 (en) |
JP (1) | JP2004251271A (en) |
AU (1) | AU2004200086A1 (en) |
CA (1) | CA2454362C (en) |
DE (1) | DE602004000575T2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090107450A1 (en) * | 2007-10-31 | 2009-04-30 | Caterpillar, Inc. | Fuel line protective cover |
US20150152824A1 (en) * | 2012-06-08 | 2015-06-04 | Honda Motor Co., Ltd. | Fuel injection device |
CN113339172A (en) * | 2021-06-18 | 2021-09-03 | 中国北方发动机研究所(天津) | Electromagnetic shielding pressing plate of common rail oil injector |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2006288107A (en) | 2005-04-01 | 2006-10-19 | Honda Motor Co Ltd | Harness exit structure of engine |
JP4628161B2 (en) * | 2005-04-04 | 2011-02-09 | 富士重工業株式会社 | Intake device for vehicle-mounted engine |
JP4692389B2 (en) | 2006-05-24 | 2011-06-01 | 日産自動車株式会社 | Intake device for V-type internal combustion engine |
DE102009016450B9 (en) * | 2009-04-04 | 2012-08-02 | Stephan Arens | 4-stroke reciprocating engine with 4 or 8 aligned in a line reciprocating piston and the crankshaft in the middle |
JP5906496B2 (en) * | 2011-02-01 | 2016-04-20 | イマジニアリング株式会社 | Electromagnetic shielding structure |
ITUD20120183A1 (en) * | 2012-10-31 | 2014-05-01 | Sg Fly Evolution S R L | "MODIFICATION KIT FOR ELECTRONIC INJECTION APPLICATION INCLUDING A CORRESPONDENT AIR CONVEYOR FOR INSTALLATION ON MOTORS FOR LIGHT AERONAUTIC SPEEDS" |
US10752373B2 (en) * | 2017-11-16 | 2020-08-25 | Textron Innovation Inc. | Air management systems for stacked motor assemblies |
WO2023183309A1 (en) * | 2022-03-24 | 2023-09-28 | Cummins Inc. | Internal combustion engine including through-bolt aperture and single through-bolt |
Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3814069A (en) * | 1971-01-01 | 1974-06-04 | Lucas Industries Ltd | Inlet manifolds |
US5003933A (en) * | 1989-11-06 | 1991-04-02 | General Motors Corporation | Integrated induction system |
US5560327A (en) * | 1993-11-08 | 1996-10-01 | Brackett; Douglas C. | Internal combustion engine with improved cycle dynamics |
US5630386A (en) * | 1993-12-29 | 1997-05-20 | Yamaha Hatsudoki Kabushiki Kaisha | Intake structure for V-type engine |
US5638784A (en) * | 1993-09-17 | 1997-06-17 | Hitachi, Ltd. | Suction device for internal combustion engine |
US6053148A (en) * | 1998-02-21 | 2000-04-25 | Ford Motor Company | Intake manifold for an internal combustion engine |
US6186106B1 (en) * | 1997-12-29 | 2001-02-13 | Visteon Global Technologies, Inc. | Apparatus for routing electrical signals in an engine |
US6296536B1 (en) * | 1999-04-27 | 2001-10-02 | Sanshin Kogyo Kabushiki Kaisha | Cowling assembly for outboard motor |
US6325053B1 (en) * | 1998-06-30 | 2001-12-04 | Cummins Engine Company Ltd. | Intake system for an internal combustion engine |
US6408811B1 (en) * | 1999-04-22 | 2002-06-25 | Visteon Global Technologies, Inc. | Vehicle engine components providing integral interconnect circuitry system |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT315008B (en) * | 1971-10-04 | 1974-05-10 | List Hans | Outboard motor for cargo boats or the like. |
WO2002010587A1 (en) * | 2000-07-27 | 2002-02-07 | Visteon Global Technologies, Inc. | Integrated powertrain control system for large engines |
-
2003
- 2003-08-05 JP JP2003286833A patent/JP2004251271A/en not_active Withdrawn
- 2003-12-29 CA CA002454362A patent/CA2454362C/en not_active Expired - Fee Related
-
2004
- 2004-01-08 AU AU2004200086A patent/AU2004200086A1/en not_active Abandoned
- 2004-01-09 DE DE602004000575T patent/DE602004000575T2/en not_active Expired - Fee Related
- 2004-01-09 EP EP04000335A patent/EP1445468B1/en not_active Expired - Fee Related
- 2004-01-14 US US10/757,025 patent/US7150255B2/en not_active Expired - Fee Related
Patent Citations (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3814069A (en) * | 1971-01-01 | 1974-06-04 | Lucas Industries Ltd | Inlet manifolds |
US5003933A (en) * | 1989-11-06 | 1991-04-02 | General Motors Corporation | Integrated induction system |
US5638784A (en) * | 1993-09-17 | 1997-06-17 | Hitachi, Ltd. | Suction device for internal combustion engine |
US5560327A (en) * | 1993-11-08 | 1996-10-01 | Brackett; Douglas C. | Internal combustion engine with improved cycle dynamics |
US5630386A (en) * | 1993-12-29 | 1997-05-20 | Yamaha Hatsudoki Kabushiki Kaisha | Intake structure for V-type engine |
US6186106B1 (en) * | 1997-12-29 | 2001-02-13 | Visteon Global Technologies, Inc. | Apparatus for routing electrical signals in an engine |
US6053148A (en) * | 1998-02-21 | 2000-04-25 | Ford Motor Company | Intake manifold for an internal combustion engine |
US6325053B1 (en) * | 1998-06-30 | 2001-12-04 | Cummins Engine Company Ltd. | Intake system for an internal combustion engine |
US6408811B1 (en) * | 1999-04-22 | 2002-06-25 | Visteon Global Technologies, Inc. | Vehicle engine components providing integral interconnect circuitry system |
US6296536B1 (en) * | 1999-04-27 | 2001-10-02 | Sanshin Kogyo Kabushiki Kaisha | Cowling assembly for outboard motor |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090107450A1 (en) * | 2007-10-31 | 2009-04-30 | Caterpillar, Inc. | Fuel line protective cover |
US8028673B2 (en) * | 2007-10-31 | 2011-10-04 | Paul Frederick Olsen | Fuel line protective cover |
US20150152824A1 (en) * | 2012-06-08 | 2015-06-04 | Honda Motor Co., Ltd. | Fuel injection device |
US9644587B2 (en) * | 2012-06-08 | 2017-05-09 | Honda Motor Co., Ltd. | Fuel injection device |
CN113339172A (en) * | 2021-06-18 | 2021-09-03 | 中国北方发动机研究所(天津) | Electromagnetic shielding pressing plate of common rail oil injector |
Also Published As
Publication number | Publication date |
---|---|
AU2004200086A1 (en) | 2004-08-12 |
CA2454362A1 (en) | 2004-07-28 |
DE602004000575D1 (en) | 2006-05-18 |
EP1445468B1 (en) | 2006-04-05 |
CA2454362C (en) | 2008-06-03 |
EP1445468A1 (en) | 2004-08-11 |
JP2004251271A (en) | 2004-09-09 |
US7150255B2 (en) | 2006-12-19 |
DE602004000575T2 (en) | 2006-08-24 |
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